I wouldn't risk that for a few reasons.
1. They may not communicate that to the tech that comes out to spray
2. You're still running the risk of something getting in your enclosures
3. Your bug issue isn't going to get fixed if you don't let them spray the entire residence.
Don't take this as me calling you lazy I promise I'm not, but don't be lazy about this. Find somewhere for your snakes to stay until this is over. It may cost you a little money to board them, but peace of mind is priceless.